Oil filter



H. G. KAMRATH 2,478,109

OIL FILTER I Filed Jan. 18, 1946 2 Sheets-Sheet l Snuentor Wei-m2 6 mmGtorncga Aug., 2, i949. H. G. KAMRATH OIL FILTER 2 Sheets-Sheet 2 FiledJan. 18, 1946 WMM 6i m2225- f w l 9L dttorncgu Patented Aug. 2, 1949 omFILTER Herbert G. Kami-ath, Flint, Mich., assignor to General MotorsCorporation, Detroit, Mich., a

corporation o! Delaware Application January 18, 1946, Serial No. 641,908

9 Claims. (Cl. 210-165) The invention herein described is an improvedoil filter. It is intended more particularly for use with engines tofilter the oil used for lubrication.

An object is to provide an efficient, simple and comparativelyinexpensive lter to be placed in the conduit of an voil circulatingsystem between a conventional pump and the bearings to be lubricated.

Other objects and advantages will be understood trom the descriptionwhich follows.

On the accompanying drawings:

Fig. i is ya longitudinal section through the alter. l

Fig. 2 is similar section on an enlarged scale oi a part shown on Fig.i.

Fig. 3 is a section' substantially on line 3 3 ci Fig. l.

Fig. t is a view in perspective, partly broken away to illustrate the4filtering member.

Fig. 5 is a. detail of one of the parts.

Referring by reference numerals to the drawings, the lter is shown ashoused within a c asing t of generally cylindrical form and having a.conical end at i. In that end there is an axial opening d and a seconddrain opening closed by a removable plug il. The side wall has anopening to receive an oil inlet fitting I3.

Over the upper end of casing d is a. gasket it. A conical cover il atits periphery is in contact with the gasket. To complete the housingassembly is a center post i9. It has a shoulder ti near one end 23. Thecenter post is projected through the center opening 9 and its shouldercontacts with the casing end l around the opening. The center postextends through the casing to a point near the cover il and is therethreaded to engage a locking nut 25 which is shouldered to engage andposition the cover il against the gasket i5. The center post has nearend 2t an axial passage 2l internally threaded at it to engage aconduit, not shown, to carry ltered oil to the bearings. At the innerend of passage 2l radial passages 3l afford communication betweenpassage 2i and the outside of the post. At the other end of the post i9is an axial passage .ti communicating with the region outside the postby spaced radial passages 35 and 3l. Within passage 33 is an aperturedplug -39 encaged by a spring-pressed ball t i.

The hlterlng element is within the casing and' assembled on the centerpost. It is built about and upon a center tube t3. rlwo concentricsleeves such as 45 and 4i so marked at one end, are dtted within eachend of the center tube.

2 Each sleeve has an internally directed flange between which fiangesisl a sealing ring 4S. These sealing rings prevent communication betweenthe annular space between the post and tube and the remainder of thespace within the casing. At the ends of the tube the sleeves are formedwith outwardly directed flanges one, such as 5|, being longer than theother and bent over it to clamp the two together. When the center tubeis assembled within the casing the inner flange of sleeve 41 rests on ashoulder 53 of the center post. A spring 55 between the cap 25' and thelonger outward flanges of the sleeves at the other end of the centertube is compressed in securing the locking nut to the post to hold thetube-rmly against the shoulder 53.

The ltering element is made from a strip of paper 56 havingr a width alittle less than the length of the center tube. It is folded at aboutthe middle of the length as at 5l to form a double layer 59, 6i -somarked on Fig. 4. Between layers 59 and 6| there is placed a separator63 in the form of a mesh element of substantially the same dimension aseach paper layer 59 or El. In assembling the paper and separator thereis placed within the -fold 5i of the paper a metallic collector manifoldt5. It is, when assembled, of i3-shape and embraces the end of theseparator The manifold is folded as shown by Fig. 5. One side E6 isfiat. In that side are out openings 63 from which project tongues lli.The other side, 'l2 is formed with cut-out regions 'it between which themetal is folded as at i6. When the parts are assembled as shown by Fig.2 the tongues project through the layer 6I of the paper with a holelbetween the tongues, through a washer 'i8 and through an aperture 8d inthe tube and within the tube they are bent over (see Fig. 3) to securethe inner convolution of the folded paper together with the separatorand manifold to the tube. Upon pressing together the two sides 66 and'I6 of the manifold the mesh separator is ilrmly gripped as is perhapsbest shown by Fig. il. Fig. 1 shows several of these devices along thelength of the tube for attaching the filtering member.

It should be stated that the edges of the folded paper are stitched asshown at 8|. At the fold the separator and manifold space the layers liband 6i so that a chamber is formed at the innermost convolution fromwhich iiltered oil is to dow through holes 68 and 80 into the elongatedannular space between the tube and the post.

In wrapping the filter element there are placed at its top and bottomregions and between the convolutions spacing strips of corrugated papermarked 83.

The oil enters the casing at I3. It lls the chamber flowing freely aswill be seen by the arrows except that the seals at the two ends of thetube keep it from entering the annular space between the post and thetube. With pressure from the pump or other source the oil passes throughone or more of the layers of paper finally reaching the chamber at theinnermost convolution from which it enters the annular space around thepost. From this space it flows through passages 3| and 2l to such adelivery pipe as may be connected to the lter at 29.

In the above description the filter element has been referred to as ofpaper. It should be explained that the paper to be used is speciallytreated to serve as a filtering element. Since the present invention isnot directed to the specific paper used nor to its preparation, it isunnecessary to go into detail as to this. The valve device in the centerpost marked by numeralsl 39, 4I is intended as an emergency by-pass. Inthe event that the paper becomes clogged so that oil cannot reach thecenter tube, the developed pressure within the casing causes the oil toflow through passages 35 and 33, through the valve, and by way ofpassage 31 to the space between the post and center tube.

as dennen by claim 1 assembled m said musing with the tube around thepost providing an annular space between the post and tube, means to sealsaid annular space from the remainder of the space within the housing,inlet means for said housing and conduit means leading fromA extendingthrough said between said housing chamber and said annular space.

'7. A filter element comprising a conduit having an aperture in a wallthereof, a double layer of lter material, sealing means securing saiddouble layer together along the perimeter of a closed flgure to providean enclosed spacev between said double layer, a securing plate posintioned in said space, a tongue bent from said The separator may be ofmetal but I prefer to than said tongue to` provide a passage throughsaid one layerof paper, said tongue extending through said hole in theone layer of paper and through the tube aperture and therein deformed tohold said paper to said tube and seal the paper around said hole to saidtube around said aperture whereby the space within the innermostsecuring plate, a hole larger than said tongue in one layer of saiddouble layer, said tongue extending through said hole in the one layerand into the aperture of said conduit. said tongue being deformed withinsaid conduit to secure said plate and double layer of filter material toconvolution of the paper communicates with the space within the tube.

2. The invention defined by claim 1, together with a spacing stripwrapped spirally about the center tube and between the convolutions ofthe paper. y 3. The invention defined by claim 1, together with a meshseparator between the' folds of paper.

4. A filter comprising a housing, a center post as defined by claim 1assembled in said housing with the tube around the post providing anannular space between the post and tube, means to seal said annularspace from the remainder of said conduit with the periphery of said holein sealing relation to `said tube about the aperture.

8; A filter. element as defined by 'claim 7, together with a meshseparator in the enclosed space between said double layer of ltermaterial, said securing plate being U-shaped in cross section andsurrounding an edge portion of said meshseparator. f

9. A filter element comprising a conduit having an aperture in a wallthereof, a double layer of filter, material, sealing means sealing saidAdouble layer together along the perimeter of a closed figure to providean enclosed space, a portion of said double layer having `a hole in oneof said layers being positioned over said aperture and in sealingcontact with said conduit around said hole and aperture, securing meanspositioned within said `space and covering said aperture, a projectionon said securing means smaller l than said hole extending through saidhole in the layer of filter material between said securing means andsaid conduit and entering said aperdisposed axially in said housing, afilter element the space within the housing, inlet means for saidhousing and conduit means leading from said annular space. f

5. A filter comprising a housing, a center post disposed axially in saidhousing, a filter element Number gur, said projection being secured tosaid con- HERBERT G. KAMRATH.

l REFERENCES CITED The following references are of record in the file ofthis patent:

1 UNITED STATES ATENTs Name v Date' A 1,693,717' Lienesch Dec. `4, 19281,742,768 Kamrath Jan. 7, 1930 1,805,903 Bull ---I May 9, 1931

